"Businesses that signed up could receive £160 from the government for every £100 they spent on fuels, such as wood pellets, burnt in biomass boilers. As people spotted the gains to be made, there was a surge in applications and costs spiralled.

Flaws in the scheme were exposed by a whistleblower who said businesses were buying biomass boilers solely to collect the subsidy. The whistleblower alleged that one farmer expected to make £1 million over 20 years for using a biomass boiler to heat an empty shed, while heating a number of empty factories would net their owner £1.5 million."